<script src="vue.js"></script>
<div id="app">
    <p>{{msg1}}</p>
    <button v-on:click="showInfo">单击我</button>
</div>
<script>
    var vue = new Vue({
        el: '#app',
        data: {
            msg1: '点击改变内容',
        },
        methods: {
            showInfo() {
                this.msg1 = "我是v-on"
            }
        }
    });
</script>